import numpy as np
import cv2 as cv
# mouse callback function
def draw_circle(event,x,y,flags,param):
 if event == cv.EVENT_LBUTTONDBLCLK:
    cv.circle(img,(x,y),100,(255,0,0),-1)
# Create a black image, a window and bind the function to window
img = np.zeros((512,512,3), np.uint8)
cv.namedWindow('image')
cv.setMouseCallback('image',draw_circle)
while(1):
 cv.imshow('image',img)
 if cv.waitKey(20) & 0xFF == 27:
    break
cv.destroyAllWindows()



